// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
public class Main {
    public static void main(String[] args) {
        Student s1 = new Student();
        s1.age=19;
        s1.name="Amin";
        s1.sex="女";
        s1.study();
        s1.introducemyself();
        Student s2 = new Student();
        s2.age=20;
        s2.name="李明";
        s2.sex="男";
        s2.study();
        s2.introducemyself();
        Bear b1 = new Bear();
        b1.brand="迪士尼";
        b1.colour="棕色";
        b1.study();
        b1.bear();
        b1.introduce();
        Bear b2 = new Bear();
        b2.brand="爱尚熊";
        b2.colour="白棕";
        b2.study();
        b2.bear();
        b2.introduce();
    }
}